[4.0] Improve article list performance on multilingual sites

[SharkyKZ]

Pull Request for Issue #25770.

Summary of Changes

Replaces JOIN and GROUP clauses in query with a subquery.

Testing Instructions

Set up a multilingual site.
Enable associations.
Create some articles and add associations.
View article list in backend.

Expected result

Works like before.

Documentation Changes Required

No.

[richard67]

I have tested this item ✅ successfully on 10687ec

Tested with MySQL 5.7 and PostgreSQL 10.10.

About performance I can't say anything because my test data set is too small.

But I can confirm everything works as well as before, carefully watching PHP error log with PHP error reporting set to maximum and watching database log.

There is a PHP notice "Undefined index: link in /layouts/joomla/content/associations.php on line 18" at least when using PostgreSQL before and after having applied this PR, so not related to this PR. This just as info for other testers.

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[alikon]

What language have you used in the installation step ?
i've tryied persian , french always got this trying to add multilanguage content sample data

[richard67]

Sometimes content languages are not added after language install. I've helped myself then with uninstalling languages and installing again.

[alikon]

seems that German - DE allows me to run sample multilanguage data (just for note on postgresql now)

[richard67]

I'm using German (DE), French and for RTC sometimes Persian.

[SharkyKZ]

@alikon you may have to create a Content Language manually.

[richard67]

I have tested this item ✅ successfully on 89e6b32

Tested with MySQL 5.7 and PostgreSQL 10.10.

About performance I can't say anything because my test data set is too small.

But I can confirm everything works as well as before, carefully watching PHP error log with PHP error reporting set to maximum and watching database log.

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[alikon]

@SharkyKZ ok maybe another issue to open if it will be still there when we will have languages pack ready for 4, anyway PR seems fine & all works as before , despite i don't have a good big dataset to do some real case performance check... i cannot trust my EXPLAIN with my short data , but it looks fine and i cannot guess how it can works worst than now...

[alikon]

I have tested this item ✅ successfully on 89e6b32

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[alikon]

RTC

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[wilsonge]

Thanks!